Derivatives of diaminodioxyarsenobenzene.



A UigITED STATES PATENT OFFICE.

GEORG KOBNDfiBFER, OF HfiCHST-ON-THE-MAIN, GERMANY, ASSIGNOR '10 FABIBWEBKE VORM. MEISTER LUCIUS & BRU'NING, OF H6CHST-ON-THE-MAIN, GERMANY, A COR- PORATION OF GERMANY.

No Drawing.

Specification of Letters Patent.

DERIVATIVES OI DIAMINODIOXYARSENOBENZENE.

To all whom it may concern Be it known that I, GEORG KoRNDiiRFER, Ph. D., chemist, a citizen of the Empire of Germany, residing at Hochst-on-the-Main, Germany, have invented certain new and useful Improvements in Derivatives of Diaminodioxyarsenobenzene, of which the following is a specification.

I have found that by treating with formaldehyde and bisulfite the 3.3 -diamino- 4.4 dioxyarsen0benzene, the latter can be converted into an acid capable of forming salts readily soluble in water with a neutral reaction. The procedure for preparing such a salt may, for instance, be as follows: One part of 3.3 -diamino-4.4 -dioxyarsenobenzene is suspended in three parts of water and after having added 0.3v parts of a 40% solution of formaldeh de and one partof a 40% solution of sodlum-bisulfite the suspension is slightly heated on the steam-bath until itis dissolved. From the solution thus obtained the free acid is isolated by the addition of hydrochloric acid, filtered off and well washed. The said acid, when dry, forms a yellowish-red powder, readily soluble in alkalis and rather dilficultly soluble in pure water, decomposing without fusion when heated, having the formula For the purpose ofconverting the acid into the sodium salt, it is suspended in about 3. parts of Water and dissolved by the addition of caustic sodalye or a solution of sodium carbonate until there is a neutral reaction. The solution thus obtained is run in a thin jet, while stirring, into 10-15 times its quantity of alcohol or acetone, whereby the sodium salt is precipitated. The mass is filtered off, washed with alcohol and dried in a vacuum.- The dry sodium-salt forms a reddish-brown, easily triturable mass, which very readily dissolves in water with an entirely neutral reaction, is insoluble in strong alcohol, and decomposes without fusion when heated. The same salt is obtained by evaporating to dryness in a vacuum the neutral solution of the acidfrom the diaminodioxyarsenobenzene. It has the formula:

As-As NH;\ nncmsoma, V

1. As new products, derivatives of the 3.3 diamino 4.4 dioxyarsenobenzene, the radicals of which have the formula:

ld ht heated, decompose without fusion.

2. As a new product, the derivative of the 3.3 diamino 4.4. dioxyarsenobenzene, having the formula:

anransom. x o n on g being a yellowish-red powder, which readily dissolves in water with a neutral reaction,

and which, when heated, decomposes without fusion.

In testimony whereof, I aifix my slgnature in presence of two witnesses.

GEORGA KORNDORFER.

Witnesses:

JEAN GRUND, CARL GRUND.

Q-NHCHaSOr on A I being. yellowish-red powders which, when Patented Apr. 30, 1912. A plication filed .February 24,1912. SerialNo. 679,668. 

